In the scene where the teenagers break into the farm, kill a pig with a sledgehammer then slit its throat, the scene was filmed in different sequences, giving the impression that a pig was killed. First, there is a shot of a pig. Then, in a different shot, we see a teenager lift the sledgehammer and bring it down (not anywhere near the pig of course). When they slit the pig’s throat, the pig is a fake with blood patches on it, with a pump hidden inside of it.